import React from 'react'
import "./index.css"

export default function Footer({ todoList, setTodoList }) {

  const getCheckedNum = () => {
    return todoList.reduce((p, c) => c.done ? p + 1 : p, 0)
  }

  // 全部选中的逻辑
  const checkAllHandle = (e) => {
    const expChecked = e.target.checked
    const newTodoList = todoList.map(item => {
      return { ...item, done: expChecked }
    })
    setTodoList(newTodoList)
  }
  return (
    <div className="todo-footer">
      <label>
        <input type="checkbox" onChange={checkAllHandle} checked={getCheckedNum() === todoList.length && todoList.length !== 0} />
      </label>
      <span>
        <span>已完成{getCheckedNum()}</span> / 全部{todoList.length}
      </span>
      <button className="btn btn-danger">清除已完成任务</button>
    </div>
  )
}
